Speed-changing mechanism.



APPLICATION FIT-ED FEB 11,1905

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No. 798,462. PATENTED AUG. 29, 1905.

R. P; SGOTT & G. H. THUMLERT.

SPEED CHANGING MECHANISM. APILIOATION FILED FEB. 11,1905.

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No.798,'462. I I PATBNTED AUG.29,1905.

R. F. SCOTT & 0. H. THUMLERT. SPEED CHANGING MECHANISM.

APPLICATION FILED FEB. 11,1905.

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UNITED STATES PATENT OFFTQE.

ROBERT F. SCOTT AND CHARLES H. THUMLERT, OF PHILADELPHIA, PENNSYLVANIA,ASSIGNORS TO EDWIN HARRINGTON, SON AND COMPANY, INCORPORATED, OFPHILADELPHIA, PENNSYLVANIA.

SPEED-CHANGING MECHANISM.

Specification of Letters Patent.

Patented Aug. 29, 1905.

Application filed February 11, 1905. Serial No- 245,232.

speeds for the feeding mechanism, to provide means for readily andeasily changing the speed, and to reduce the opportunities for error.

The nature and characteristic features of our improvements will morefully appear by reference to the following description and theaccompanying drawings, in which- Figure 1 represents a top plan view ofthe invention. Fig. 2 represents a side elevation thereof. Fig. 3represents an end elevation thereof. Fig. 4 represents a developed viewof the variable-speed-gear trains and mechanism for changing them. Fig.5 represents a sectional elevation of a set of gears and the changingmechanism for a set of gears coacting therewith, and Fig. 6 represents aplan view of the primary change-screw and indexing device. 6

As shown in the drawings, the base 1 supports the head-stock 2, in whichis journaled the live-spindle 3, provided with the drivingcone 4 ofusual construction. The revolution of this spindle revolves the gear 5,fixed thereon, for driving the gears 6 and 6, revolubly,

mounted on the studs 7 and 7, carried by the tumbler-frame 8, whichrocks upon the studshaft 9. A slot 10 in the tumbler-frame is engaged bya stationary bolt 11, which passes therethrough and is set in thehead-stock to limit the throw of the frame, the latter being rocked bythe handle 12 to engage and disengage the gears 6 and 6 alternately withthe gear 5. The gear 6 engages a gear 13, which is fixed to the gears 14and 15 and revoluble therewith on the stud-shaft 9, While the gear 6'engages a gear 16, which engages the gear 13, the gear 16 beingjournaled on a stud 17, carried by the tumbler-frame It will beunderstood that by throwing the tumbler-frame 8 and clamping it so as tohold the gears 6 and 6 alternately in engagement with the gear 5 thegears 13, 14, and 15 may be driven as a unit alternately in oppositedirections.

The integrally-connected gears 18, 19, 20,

and 21 are rotatable and longitudinally movable on the shaft 22, carriedby the tumblerframe 23, which is fulcrumed by a shaft 24, carried by thecasing 2 1'. The nest of gears carried by the shaft 22 is driven at ahigh speed by engaging the small gear 18 with the large gear 14:, at alow speed by engaging the large gear 19 with the small gear 15, and atan intermediate speed by engaging the large gear 19 with the large gear14. To effect these several engagements of the gears, the gear-nestcarried by the shaft 22 is oscillated by the tumbler-frame 23 and movedlongitu dinally by the fork 25, which engages the collar 26, the forkbeing carried by a sleeve 27, moved longitudinally by a worm-shaft 28.This worm-shaft is journaled in the tumblerframe members 23 and 23",which are hinged together thereby,and the tumbler-frame member 23' isformed in sections, whereby flexibility of action for obtaining theregistration of the gears to be engaged is obtained, a limited movementbetween the sections being permitted by means of a pin 29, secured toone of the sections and a link 30, secured to the other of the sectionsand having a slot therein engaging the pin. The worm-shaft 28 isrevolved by the crank 31, havinga handle 32, which operates a pin 33 forengaging a hole 3 in the casing 35 and holding the shaft, a singlerevolution of the handle effecting a movement of the gear-nest from oneengagement and speed to another.

The tumbler-frame 23 is provided with the tube 80, having therein thebolts 81, with the handles 82 fixed thereto, the bolts being pressedoutward by the spring 83, placed be.- tween them in the tube, and causedthereby to engage holes 84' in the frame, whereby the gears are held inthe engagement desired.

On the worm-shaft 28 is fixed a pinion 36, which engages a spur-wheel37, journaled on a stud 38, carried by the casing 35. The spurwheel 37has fixed thereto a pinion 39, which engages a spur-wheel 40, fixed to adial or index-disk 11, journaled on the worm-shaft 28. The gears 36, 37,39, and 40 are related, so that a single revolution of the handleproduces but a fraction of a revolution of the dial and so that theworm-shaft may be turned through the number of revolutions necessary tomove the gears 18, 19, 20, and 21 between the limits of their throwwithin a complete revolution of the dial, the latter being indexed incorrespondence with the engaging gears producing the various speeds.

The gears 19, 20, and 21 are adapted to engage the respective gears 42,43, and 44, which are fixed together with the gear 45 and revolve on theshaft 24, carried by the frame 24. The gear 45 engages with anidler-gear 46, which is journaled on the shaft 47, carried by the frame,and drives a gear 48, fixed on the shaft 49, journalcd in the frame.When the small gear 18 engages the large gear 14, the large gear 19engages the small gear 42 and the shaft 49 is driven at its highestspeed. When the large gear 19 engages the large gear 14, it also engagesthe smallgear 42, and the shaft 49 is driven at the highest intermediatespeed. When the large gear 19 engages the small gears 15 and 42, a thirdspeed is obtained. When the large gear 19 engages the small gear 15 andthe gear 20 engages the gear 43, a fourth speed is obtained for theshaft 49. When the large gear 19 engages the small gear 15 and the smallgear 21 engages the large gear 44, the lowest of the five speeds of theshaft 49 is obtained.

A sleeve 50, splined on the shaft 49, has fixed thereon the gear 51,which engages with a gear 52, fixed to a stud 53, journaled in a yoke54. This yoke is fulcrumed on the sleeve and provided with an arm 55,which is movable in an inclined slot 56 of the frame 24. The arm has aknob 55, which carries a pin 57, pressed in by a spring 58, engagedtherewith and with the arm, the pin being adapted for engaging the holes59, extending parallel to the slot. By rocking the yoke 54 and moving itlongitudinally 0n the shaft 49 the gear 52 may be engaged with any oneof a cone of gears 60. fixed onashaft 61, which is journaled inbearings-61 and 61 in the frame, the gear 52 being held in itsengagement with the proper gear of the cone by the engagement of the pin57 with the corresponding one of the holes 59 which register with thegears of the cone.

To effect the longitudinal movement of the yoke, it is engaged by aworm-shaft 62, journaled in the frame. The shaft is revolved by abevel-gear 63, fixed thereon and engaged by a bevel-gear 64, fixed onashaft journaled in the frame. This shaft 65 is revolved-by a lever 66,having a handle 67 for operating a pin 68, which engages a hole 69 inthe casing, a complete revolution of the handle shifting the gear 52from one to the next of the gears 60.

Fixed to the shaft 65 is a pinion 70, which engages a spur-wheel 71,revolubly mounted on the stud 72, carried by the casing, the spur-wheel71 having fixed thereto a pinion 73, which engages with a spur-Wheel 74,fixed to a dial or index-disk 75, revoluble on the shaft 65. Therelation between the gears of the train for operating this dial is suchthat it reduces the motion of the handle so that a single revolutionthereof producesbut a frac tional revolution of the dial while movingthe gear 52 out of engagement with one of the cone-gears and intoengagement with another adjacent thereto, the gear 52 being movable fromone end of the cone to the other within the limits of a completerevolution of the dial, which bears an index visible through the opening76 for indicating thespeed of the engaging gears. A gear 77 is fixed onthe shaft 61 and engages a gear 78, fixed on the leadscrew 79, which isrevolved thereby.

It will be understood that this mechanism, while especially adapted foruse in lathes, is not limited to such use, but is generally adapted forvarying the speed between a driving and driven device.

Having described our invention, we claim- 1. In apparatus of the classdescribed, a spindle, a gear thereon, a fulcrumed tumblerframe, a nestof gears, gears carried by said tumbler-frame for connecting said firstgear with said nest of gears, and a gear movable parallel andtransversely to said nest of gears to engage different gears of saidnest, substantially as specified.

2. In apparatus of the class described, aspindle, a gear thereon, afulcrumed tumblerframe, gears journaled on saidframe and engagedalternately with said first gear by tilting said frame, a gear revolubleabout the axis on which said frame is fulcrumed and engaged with thegears carried thereon, variable-gear trains adapted to be connected withand operated by the gear on said fulcrum, and means for connecting anddisconnecting said variable gear trains, substantially as specified.

3. In apparatus of the class described, a pair of gears, a second pairof gears, and a worm connected with said second pair of gears forchanging their engagement with said first pair of gears, substantiallyas specified.

4. In apparatus of the class described, a pair of integrally-connectedgears having different diameters, a second pair of integrallyconnectedgears having different diameters, a worm for longitudinally moving and aframe for oscillating said second pair of gears to change theirengagement with said first pair of gears, substantially as specified.

5. In apparatus of the class described, a

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spindle, a gear thereon, a fulcrumed tumblergears having differentdiameters, a sleeve having means for engaging and moving said sec ondset parallel to said first set of gears, a worm-shaft engaging saidsleeve, and a tumbler-frame supporting said second set of gears forchanging their engagement with said first set, substantially asspecified.

7. In apparatus of the class described, a set of integrally-connectedgears having different diameters,a second set of integrally-connectedgears having different diameters, a tumblerframe, a shaft carried bysaid frame on which said second set of gears is movable longitudinally,a worm, means connecting said worm with said second set of gears, alever for revolving said worm, and means for holding said lever and wormwhen a gear of said second set has been brought into proper engagementwith a gear of said first set, said worm being pitched so that a singlerevolution thereof changes the engagement between said sets of gears,substantially as specified.

8. In apparatus of the class described, a worm-shaft, a gear, .a set ofgears, means whereby said worm causes said gear to engage differentgears of said set, a dial, and a train of reducing-gears operated bysaid worm-shaft for operating said dial to index the action of saidmechanism, substantially as specified.

9. In apparatus of the class described, a worm-shaft, a gear, a set ofgears, means whereby said worm effects different engagements betweensaid first gear and the gears of said set, a dial revoluble on saidwormshaft, a train of reducing-gears connecting said worm-shaft anddial, a lever for revolving said worm-shaft, and means for holding saidshaft and lever in the position corresponding to the engagement of saidfirst gear with the several gears of the set with which it engages,substantially as specified.

10. In apparatus of the class described, a set of integrally-connectedgears, a second set of integrally-connected gears movable parallel tosaid first set of gears and adapted for making several engagementstherewith, a third set of integrally-connected gears with which saidsecond set of gears is adapted for making several engagements, arevoluble wormshaft, and means for connecting said wormshaft and secondset of gears whereby the former moves the latter in effecting severalengagements with said first and third sets of gears, substantially asspecified.

11. In apparatus of the class described, a gear-cone, a fulcrumedsupport, a gear carried by said fulcrumed support and adapted to engageseveral gears of said cone, and a worm for shifting said support and thegear carried thereby, substantially as specified.

12. In apparatus of the class described,a set of gears, a gear, anoscillatingsupport for said gear movable parallel to said set of gearsfor engaging said gear with several gears of said set,-a worm-shaftconnected with said support, a revoluble shaft, means connecting saidrevoluble shaft with said worm-shaft, a

dial for indexing the action of said gears, and means whereby said dialis operated by said revoluble shaft, substantially as specified.

13. In apparatus of the class described,a set of gears, a gear forengaging gears of said set, an oscillating support for said gear movableparallel to said set of gears, a revoluble worm-shaft connected withsaid support, a- .bevel-gear on said worm-shaft, a revolubleshaft and abevel-gear thereon for driving said first bevel-gear, a dial, and atrain of gears connecting said revoluble shaft and dial, substantiallyas specified.

14:. In apparatus of the class described, a revoluble shaft, a gearrevolubly fixed and longitudinally movable thereon, a yoke oscillatableand longitudinally movable on said shaft, a worm-shaft for moving saidyoke, a

gear revolubly supported by said yoke and engaging said first gear, ashaft, a gear-cone on said last-named shaft the gears of which saidsecond gear is adapted to engage, a driven shaft, and mechanismconnecting said gearcone with said driven shaft, substantially asspecified. y

15. In apparatus of the class described, a primary set of gears, asecondary set of gears,

a tertiary set of gears, means for varying the engagement of saidsecondary with said primary and tertiary set of gears whereby differentspeeds may be produced, a revoluble shaft connected with and driven bysaid tertiary set of gears at different speeds, a driven shaft, andmechanism comprising speedchanging gears connecting said first and lastnamed shafts, substantially as specified.

16. In apparatus of the class described, a tumbler frame havingrelatively movable parts, engaging gears carried by the respectivemovable parts thereof, and a gear with which said engaging gears areconnected and disconnected by moving said frame, substantially asspecified.

17. In apparatus of the class described, a fulcrumed frame, a gearcarried thereby, a second gear engaged and disengaged with said firstgear by swinging said frame, a pair of spring-pressed boltsreciprocating in said frame, mechanism engaged by said bolts to holdsaid frame, and handpieces on said bolts 01;i disengaging them,substantially as speci- 18. In apparatus of the class described, a

fulcrumed frame comprising parts that are,

& 798,462

ing gears carried by said frame, a worm-shaft carried by said frame, andmechanism Whereby said worm-shaft changes the engagement between saidsets of gears, substantially as specified.

20. In apparatus of the class described, a set of gears, atumbler-frame, a set of gears carried by said frame and adapted'to beengaged thereby with said first set of gears, a second set of gearscarried by saidframe and engaging with the first-named set of gearscarried by said frame, a worm-shaft, and

mechanism connecting said Worm-shaft with the first-named set of gearscarried by said frame for changing its engagements with the 5 other setsof gears, substantially as specified.

In testimony whereof we have hereunto set our hands, this 7th day ofFebruary, 1905, in the presence of the subscribing witnesses.

ROBT. F. SCOTT.

CHAS. H. THUMLERT.

Witnesses:

UTLEY E. CRANE, Jr., ROBERT JAMES EARLEY.

